Fixed a potential crash related to the usage of pollset.
Fixed a potential crash related to the usage of pollset.

Multiple instances of a descriptor being removed from pollset may have already been set and returned by a poll() call. For instance, poll() returns at least 2 descriptors: one is a wakeup call to remove a channel and destroy the associated connection, the other is an incoming MRCP message sent over the same connection. Since the connection object may no longer be available after the descriptor has been removed, processing of the received MRCP message in these circumstances could lead to a crash.
AaronZhangL/unimrcp,andrenatal/unimrcp,andrenatal/unimrcp,pgaval/unimrcp,andrenatal/unimrcp,MattRiddell/unimrcp,MattRiddell/unimrcp,MattRiddell/unimrcp,pgaval/unimrcp,AaronZhangL/unimrcp,AaronZhangL/unimrcp,pgaval/unimrcp